Crystal Semiconductor Corp.
104Patents
0Active
104Granted
43Portfolio score
Filing activity: Dec 16, 1985 → Nov 20, 2000
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5319370A | Analog-to-digital converter with a continuously calibrated voltage reference | Physics | 144 | Expired |
| US5440305A | Method and apparatus for calibration of a monolithic voltage reference | Physics | 141 | Expired |
| US6088461A | Dynamic volume control system | Electricity | 134 | Expired |
| US4943807A | Digitally calibrated delta-sigma analog-to-digital converter | Electricity | 124 | Expired |
| US5477481A | Switched-capacitor integrator with chopper stabilization performed at the sampling rate | Electricity | 111 | Expired |
| US5157395A | Variable decimation architecture for a delta-sigma analog-to-digital converter | Electricity | 103 | Expired |
| US4851841A | Gain scaling of oversampled analog-to-digital converters | Electricity | 95 | Expired |
| US5012244A | Delta-sigma modulator with oscillation detect and reset circuit | Electricity | 94 | Expired |
| US5594612A | Analog-to-digital converter with digital linearity correction | Electricity | 88 | Expired |
| US5594439A | Diagnosing problems in an electrical system by monitoring changes in nonlinear characteristics | Electricity | 86 | Expired |
| US4939516A | Chopper stabilized delta-sigma analog-to-digital converter | Electricity | 82 | Expired |
| US5696708A | Digital filter with decimated frequency response | Electricity | 81 | Expired |
| US5777912A | Linear phase finite impulse response filter with pre-addition | Electricity | 78 | Expired |
| US5541864A | Arithmetic-free digital interpolation filter architecture | Electricity | 77 | Expired |
| US5212659A | Low precision finite impulse response filter for digital interpolation | Electricity | 74 | Expired |
| US5574475A | Signal driver circuit for liquid crystal displays | Physics | 72 | Expired |
| US4746899A | Method for reducing effects of electrical noise in an analog-to-digital converter | Electricity | 70 | Expired |
| US5274375A | Delta-sigma modulator for an analog-to-digital converter with low thermal noise performance | Electricity | 67 | Expired |
| US5583501A | Digital-to-analog converter with digital linearity correction | Electricity | 67 | Expired |
| US6212273A | Full-duplex speakerphone circuit including a control interface | Electricity | 64 | Expired |
| US5631900A | Double-Talk detector for echo canceller | Electricity | 63 | Expired |
| US5257026A | Method and apparatus for calibrating a multi-bit delta-sigma modular | Electricity | 62 | Expired |
| US5818370A | Integrated CODEC with a self-calibrating ADC and DAC | Electricity | 61 | Expired |
| US5644308A | Algorithmic analog-to-digital converter having redundancy and digital calibration | Electricity | 60 | Expired |
| US5220483A | Tri-level capacitor structure in switched-capacitor filter | Electricity | 57 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.